Despite the ICC match referee Andy Pycroft already informing the Australians of a ball tampering charge against Bancroft, Sutherland said Roy's investigation would home in on the team issues at hand.
It was Smith's last appearance in the series after being banned for one match for his role in the ball tampering scandal, which means he will miss the fourth Test.
Before the start of play on Sunday at Newlands, Smith and Australian vice-captain David Warner agreed to stand down from their positions for the remainder of the match.
"It was extremely hard, that's no excuse for what you saw in the last 45 minutes", Paine said, having finished unbeaten on nine then apologised to Australian fans in the post-match ceremony.
The charge did not result from any accusations by Australia but vice-captain David Warner told reporters afterwards: "We hold our heads high and I'd be very disappointed if one of our team members did that".
"It's not what we want to see in the game, it's not what the Australian cricket team is about", a remorseful Smith said while sitting alongside Bancroft at a packed post-match press conference in South Africa. "I look at the incredible achievement over four days, the way we applied pressure to the Australian team in all facets of the game", said Du Plessis. Shukla said they will wait and decide on Smith's future in the IPL season basis the ICC decision.
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South Africa set Australia 430 to win after posting 373 in their second innings.
Australia's Steve Smith and Cameron Bancroft received a hostile reception from South African supporters, following their admission they tried to tamper with the ball during the third Test. "I still think I'm the right person for the job", he said.
Tim Paine filled in for Steve Smith, who was stood down as captain after the incident.
"One of the unique things about the game of cricket, is it is to be played not only within the laws of the game, but in the spirit of the game. It's not in the spirit of the game", he said.
"Cricket Australia and Australian cricket fans expect certain standards of conduct from cricketers representing our country, and on this occasion these standards have not been met".
Team manager Mohammed Moosajee, an influential figure within Cricket South Africa, said he did not believe the scandal would affect relations between the cricket boards of the two nations.
As soon as the incident was shown on the giant screen, the player was questioned in the presence of his captain Smith by the two on-field umpires, Richard Illingworth and Nigel Llong, who, along with third umpire Ian Gould and fourth umpire Allahudien Palekar, later charged Bancroft.
- 2010 - Pakistan all-rounder Shahid Afridi was caught on camera biting the ball during a one-day worldwide against Australia in Perth.
Now that he has been suspended by the ICC for the final Test at the Wanderers over the Easter Weekend, Smith won't lead out the team in the series decider.
Smith later admitted Bancroft had been instructed to tamper with the ball by the team's "senior leadership" group.
"The fact that Australia have admitted to what they have done", he said.
Black Caps four wickets from Test triumph
The innings was only into its third over when Trent Boult had Alastair Cook caught down the leg side by Watling for two. England's Joe Root reacts after being bowled during the first day of the first cricket test match.